ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The relationship between the deformation orientation distribution function (ODF) and theprimary recrystallised ODF in cold and warm rolled metals, is not a simple mathematicaltransformation from one to the other, but is through thermally activated processes occurring in thedeformation microstructure. In BCC metals the mature rolling microstructure consists of cells,microbands and shear bands on a length scale of fraction of a micron, to deformation and transitionbands at the grain scale, when this is of the order of 10 or more microns. There is evidence thatgrain boundary regions are sometimes distinct from grain interiors. Wherever there is a relativelysharp change in either orientation or microstructure such locations are potential sites ofrecrystallisation nuclei. In this paper the results of a systematic investigation of the development ofmicrostructure in rolled interstitial free (IF) steel using both transmission and scanning electronmicroscopy are presented. It is shown how the dislocation mesh structure, formed at the earlieststages of rolling, develops into the mature microstructure consisting of cells, microbands and shearbands. Deformation heterogeneities in the microstructure, known to be of vital significance in therecrystallisation process are associated with the α and γ fibre components of the rolling texture.Shear band thickening and α grain fragmentation are also considered, since both processes canproduce recrystallisation nuclei, which in the α fibre case can reduce desirable mechanicalproperties
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.61.pdf
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